Request Entity Too Large

I got this error when do this
```
with:
to: ***
token: ***
message: sharingan report
message_file: ./events/ruanyf/ruanyf.json
```

The report names the GitHub Action inputs and ./events/ruanyf/ruanyf.json, but no implementation file or test. Start by reproducing the action with the supplied configuration and inspect how message_file is handled; done means the request-size failure is understood and the resulting behavior is verified.

Written by the indexing model from the issue text.